If 750 feet of pipe is being laid at a 0.5% slope, approximately how many contour intervals are depicted on a map with 6-inch contour intervals?

To determine how many contour intervals are depicted on a map when laying 750 feet of pipe at a 0.5% slope, it's essential to first understand what a 0.5% slope means. A 0.5% slope indicates that for every 100 feet horizontally, the elevation changes by 0.5 feet.

To find the total elevation change over the 750 feet, you can calculate it as follows:

• Elevation change = (slope percentage/100) x horizontal distance

• Elevation change = (0.5/100) x 750 feet = 3.75 feet.

Next, to convert this elevation change into contour intervals, you need to know the height of each contour interval on the map. In this case, the map uses 6-inch intervals. Since 6 inches equals 0.5 feet, you will divide the total elevation change by the height of each contour interval.

• Total elevation change = 3.75 feet

• Height of each contour interval = 0.5 feet

• Number of contours = Total elevation change / Height of each contour interval = 3.75 feet / 0.5 feet = 7.5.

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